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Rafael Nadal of Spain reacts during his semifinal match against Grigor Dimitrov of Bulgaria at the Australian Open on Jan. 27.
LUKAS COCH, EPA

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Grigor Dimitrov of Bulgaria serves in his semifinal match against Rafael Nadal of Spain during the Australian Open on Jan. 27.
Scott Barbour, Getty Images

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Rafael Nadal of Spain looks on in his semifinal match against Grigor Dimitrov of Bulgaria during the 2017 Australian Open at Melbourne Park on Jan. 27.
Scott Barbour, Getty Images

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Bulgaria's Grigor Dimitrov yells while playing Spain's Rafael Nadal during their semifinal at the Australian Open on Jan. 27.
Dita Alangkara, AP

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Bulgaria's Grigor Dimitrov reacts after a point against Spain's Rafael Nadal during their men's singles semi-final match during the Australian Open on Jan. 27.
SAEED KHAN, AFP/Getty Images

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Stan Wawrinka of Switzerland congratulates Roger Federer of Switzerland on winning their semifinal match at the Australian Open on Jan. 26.
Clive Brunskill, Getty Images

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Roger Federer of Switzerland celebrates winning match point in his semifinal match against Stan Wawrinka during the 2017 Australian Open on Jan. 26.
Scott Barbour, Getty Images

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Roger Federer plays a forehand smash in his semifinal match against Stan Wawrinka during the 2017 Australian Open on Jan. 26.
Cameron Spencer, Getty Images

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Detailed view of Stan Wawrinka's broken racquet between games in his semifinal match against Roger Federer on Jan. 26.
Quinn Rooney, Getty Images

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Switzerland's Roger Federer makes a forehand return to compatriot Stan Wawrinka during their semifinal at the Australian Open tennis championships in Melbourne, Australia, on Jan. 26, 2017.
Aaron Favila, AP